21031113005 has 16 divisors (see below), whose sum is σ = 29069783040. Its totient is φ = 14307777792.

The previous prime is 21031113001. The next prime is 21031113007. The reversal of 21031113005 is 50031113012.

It is not a de Polignac number, because 21031113005 - 2² = 21031113001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031113001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2361260 + ... + 2370149.

It is an arithmetic number, because the mean of its divisors is an integer number (1816861440).

Almost surely, 2^21031113005 is an apocalyptic number.

It is an amenable number.

21031113005 is a deficient number, since it is larger than the sum of its proper divisors (8038670035).

21031113005 is a wasteful number, since it uses less digits than its factorization.

21031113005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731548.

The product of its (nonzero) digits is 90, while the sum is 17.

Adding to 21031113005 its reverse (50031113012), we get a palindrome (71062226017).

The spelling of 21031113005 in words is "twenty-one billion, thirty-one million, one hundred thirteen thousand, five".